Measuring the Effects of Work Loss on Productivity with Team Production
Sean Nicholson, Mark Pauly, Daniel Polsky, Claire Sharda, Helena Szrek, Marc Berger
Health Economics, vol. 15, 2006, p. 111-123.

Productivity in Pharmaceutical-Biotechnology R&D: The Role of Experience and Alliances
Patricia Danzon, Sean Nicholson, Nuno Sousa Pereira
Journal Of Health Economics, vol. 24, 2005, p. 317-339.